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Operating expenses - Taxes and fees with the Regulatory Authority (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expenses |  |  |
Turnover tax | $ (3,528) | $ (2,817) | $ (2,122)
Taxes with the Regulatory Authority | (1,049) | (1,078) | (917)
Tax on deposits to and withdrawals from bank accounts | (626) | (539) | (403)
Municipal taxes | (531) | (395) | (289)
Other taxes | (373) | (296) | (212)
Total taxes and fees with the regulatory authority | $ (6,107) | $ (5,125) | $ (3,943)

X
- Definition The amount of tax expense exclusive of income tax expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_TaxExpenseOtherThanIncomeTaxExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | teo_DisclosureOfOperatingExpensesAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of tax expense classified as other. + References No definition available. + Details
Name: | teo_IfrsTaxesOther
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of municipal taxes. + References No definition available. + Details
Name: | teo_MunicipalTaxes
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of tax on deposits to and withdrawals from bank accounts. + References No definition available. + Details
Name: | teo_TaxOnDepositsToAndWithdrawalsFromBankAccounts
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of taxes with the regulatory authority. + References No definition available. + Details
Name: | teo_TaxesWithRegulatoryAuthority
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax on turnover. + References No definition available. + Details
Name: | teo_TurnoverTax
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration